Draw-cord weaving mechanism for textile looms



Jan. 2, 1951. c. H. WILLIAMS 2,536,247

DRAW-CORD WEAVING MECHANISM FOR TEXTILE LOOMS Filed Dec. 9, 1947 5 Sheets-Sheet l 5 01242270 Jan minds 43 FIG. IO. F|G.9. wzfllamwwlw 1951 c. H. WILLIAMS DRAW-CORD WEAVING MECHANISM FOR TEXTILE LOOMS Filed Dec. 9, 1947 5 SheetsSheet 5 l. 66) 6% IZGIZ FIG. I3.

5 MM My m H N m r H C Arrow/Ev:

Patented Jan. 2, 1951 DRAW-CORD WEAVIN G MECHANISM FOR TEXTILE LOOMS Charlton Hudson Williams, Columbus, Ga., assignor to Swift Manufacturing Company, lumbus, Ga., a corporation of Georgia Application December 9, 1947, Serial No. 790,469

10 Claims.

The present invention relates to improvements in draw-cord weaving mechanism for textile looms and has for an object to provide a mechanism for weaving a draw-cord into the leno material in accordance with a prearranged plan in which the draw-cord will have the necessary freedom of movement in the woven material to permit it to function as a draw-cord, for instance in connection with bags or sacks containing oranges and the like material.

Another object of the invention is to provide a draw-cord weaving mechanism of a unitary character suitable for installation in existing looms without material structural modifications of the same.

The invention further contemplates the provision of mechanism which may be installed on either a Draper type cam loom or on a Crompton and Knowles box loom or other type of loom which will be economical to install and maintain.

Heretofore it has been the practice to insert draw-cord into leno material by unskilled labor which has been found to involve considerable expense in the manufacture thereof, and it is a further object of the present invention to provide automatic mechanism for the weaving of drawcord at the same time leno material is being woven and at greatly reduced expense.

With the foregoing and other objects in view,

the invention will be described more fully hereinafter and more particularly pointed out in the appended claims.

In the drawings in which the same reference characters are used to denote the same parts throughout the several views:

Figure 1 is a vertical transverse section taken through the frame of a cam loom wherein a draw-cord weaving device constructed in accordance with the present invention is installed.

Figure 2 is a fragmentary vertical longitudinal section taken on the line 2-2 in Figure 1.

Figure 3 is a fragmentary horizontal section taken on the line 3-3 in Figure 2.

Figure 4 is a fragmentary perspective View of the improved draw-cord weaving mechanism.

Figure 5 is a fragmentary side elevational view taken at the rear portion of the cam loom showing the placement of the supply of draw-cord on the loom with the friction strap removed.

Figure 6 is a fragmentary end elevation of the loom taken from the right hand end of Figure 5.

Figures 7, 8, 9 and 10 are side elevational views of the cam and follower showing the various successive phase positions thereof.

Figure 11 is a fragmentary perspective view of a modified form of the present invention as installed on a Crompton and Knowles box loom.

Figure 12 is a side elevational view of a form of bracket employed in the modified device.

Figure 13 is a fragmentary top plan view of the bracket together with stud broken away.

Figure 14 is a side elevational view of a form of frame support for the bracket, and

Figure 15 is a top plan view of the same.

Referring more particularly to the drawings, and for the present to that form of the invention shown in Figures 1 to 10 inclusive, 2G designates a conventional lay sword affixed to a lay sword shaft 2! journaled in bearings 22 and 23 on the loom frame members 24 and 25.

An arm 28 adjacent the lay sword is also affixed to the lay sword shaft 2| and fixedly carries a pawl shaft 27 on which is rotatably supported a pawl having at its free end a, tooth 29 for sliding over and engaging the ratchet teeth 30' on a ratchet wheel 3!. Such ratchet wheel 31 is afiixed to a cam shaft 32. The cam shaft is mounted in bearings 39 and 4% upon appropriate parts of the loom frame and intermediate its ends such shaft carries fixedly thereon a cam 33 having a low point or a low side 34 and a high point or lobe 35 which may be approximately semi-circular in length in the form shown in the invention.

Also affixed upon the cam shaft 32 are one or more brake drums 36 over which frictionally engage the brake bands or straps 3'! tensioned by coil or other springs 38 which may engage about parts of the loom framework.

The cam is engaged by a follower which may be in the form of one or more rollers 43 journaled on a pin 42 carried by the free end of an arm 4| loosely mounted to rotate about the lay sword shaft 2!. To the pin 42 is connected a strap 44 which as more particularly shown in Figures 1, 2 and 5 is suspended at the lower end of a harness wire 45 having an eyelet 46 through which passes the draw-cord 41. The harness wire 45 is carried by a, flexible strap 48 trained over guide spools 49 rotatably carried upon guide spool shafts 56 supported in the upper end of the arch 5| as by clamps and bolts 52 and 53 respectively. This latter structure is shown to advantage in Figure 2, from which it will also be seen that spacers 54 maintain the spools 49 in proper position on the shafts 50. These spacers 54 may be in the form of set collars.

The other end of the strap 48 carries a harness wire 45 having an eyelet 45 to receive a second draw-cord ll The lower end of the harness wire 45 is connected to the upper end of a coil spring 55 through a strap TI. The lower end of the coil spring 55 is anchored to a part of the framework.

Referring more particularly to Figures and 6, a warp beam 78 is shown as carrying a mass of warp i9 receivable over a whip roll 63 carried in the conventional whip roll support .57. In the customary manner the warp is carried forwardly from the whip roll to the usual harness (omitted for clearness) The draw-cord harness 45, 85 is situated close to the conventional harness and heddle frames for the warp mass 79.

A supply of draw-cord is contained on a spool 55 which may be removably mounted upon a shaft 59 which is removably journaled in bearing supports 58 and 58 carried by the loom frame 2% preferably above or adjacent the warp beam 78 as best seen in Figures 5 and 6; whereby the draw-cord @1? may be led from the spool 6; down and passed beneath the whip roll 63 and thence brought forwardly over the upper side of the whip roll 63 to take its place alongside the warp mass 39; it being understood that this draw-cord 4; is in alignment with the eyelet 5.5 of the :drawcord harness wire 45. Where a second draw-cord 57 is to be woven, a second draw-cord supply spool will be mounted at the opposite side of the loom in alignment with the eyelet 45 of the draw-cord harness wire 45 A friction strap 5| is in any desired manner laid over the spool 65 so as to impose necessary friction on the drum 60 to prevent overrunning of the same. The friction stra 6| is connected by springs 62 with parts of the framework to impose the necessary tension on the strap 6! and the drum or spool 60.

When the supply of draw-cord is exhausted and requires replenishing, the shaft '59 may :be lifted from the open bearing 58 .and drawn axially out from the inner bearing 58 it being understood that the friction strap -6l is first disengaged from the spool 50. Such spool 60 may then be slid off the shaft 59 and a full spool 60 take its place and the shaft '59 be restored to the bearings by first introducing the inner end of the shaft into the closed bearing 58 and thereupon drawing the outer end of the shaft into the open bearing 58. The strap 6| can then be lifted over the drum and the draw-cord 47 drawn down and around the whip roll 63 and threaded through its harness.

In operation, with a supply of the draw-cord in place and threaded through its harness, the loom is set in motion in the ordinary manner. As the lay sword 2i! continuously rocks fore and aft to beat up the lay, the arm 28, shaft 2? and pawl 26 partake of this same oscillating movement by which in its rear movement :the pawl tooth 29 slides over the inclined wall of a tooth 38 of the ratchet wheel '31 to engage behind a shoulder of the :next adjacent tooth. On the forward movement of the lay sword '29, the pawl 26 will be correspondingly drawn forward through the same are of movement pulling upon the ratchet wheel 3! thereby imparting rotation to the cam shaft 32 through an angular distance corresponding to the radius of arm 28 which is calculated'with reference to thesize and arrangement and number of teeth 36 of the ratchet wheel 33 to move the cam shaft 32 .a distance corresponding to one pick of the loom. Thus at each 4 forward stroke of the lay sword 20 the cam shaft 32 will be given an angular rotation corresponding to one pick of the loom, by way of example the ratchet wheel 3| is shown to have l2 teeth and the high point of the cam 35 to be a substantial semi-circle. Consequently six picks of the loom will take place while the high point 35 of the cam is rotating continuously in contact with the cam follower 43 and holding the same depressed. Figures 4 and 8 show the high point or lobe 35 of the cam as having just engaged the follower roller i-3,such follower roller being at its maximum depressed position in which it has pulled down the strap 46 and the harness wire 45 so that the draw-cord 47 is pulled down to the bottom of the shed thereby permitting the passage of the weft thread thereover. In pulling the harness wire 45'down the companion harness wire is elevated to the top of the shed so that the weft passes beneath'the other draw-cord 41 The spring 55 is expanded and put under tension. This condition prevails during the entire time that the high point 65 of the cam is rotating in contact with a cam follower roller '43. In :the example shown in the drawings this interval is one of corresponding to si5; teeth 39 on the ratchet wheel 5|, .-or in other words one 'half of the number of teeth on the ratchet wheel 5-1. Thus the draw-cord 4! and M will be held in these positions during six picks of the loom.

Figure 7 shows the fiat side ,34 .of the cam as engaging the follower roller -43 when the follower roller is in its uppermost position. It requires one pick to move from the position of Figure 7 to the position of Figure 8.. --Figure :9

shows the high point of the cam 35 having covered a distance of approximatel three picks. Figure 19 shows the highpointof the cam having moved six picks and freed the cam follower 1:3 which is thereupon pulled upwardly by the spring 55 acting through the harness and strap linkage.

Figure 1 shows the spring 55 in its expanded position with the eyelet 45* elevated above the shed or Wait race and the eyelet st depressed be- However when the parts are heath the same. I in the position shown i'nFigure 10 the coil spring 55 pulls down the eyelet 45 and its entrained c lr'aw-cord i? and {correspondingl elevates'the eyelet E 6 and the opplosite'draw-icbrd It? so that the same are respectively below and above the raceway or shed for a'ti'me interval. The low point of the cam alsojb'e'ing of an arcuat'e length of 180 in the example shown in the drawings. The draw-cord will remain in this position for six picks until the parts again arrive at the relative positions shown in Figure 7. Thus the draw-cord is woven into the material alternately at a spaced distance of-six picks which gives the same the'requisite loosenes's for pulling through v the material in the character and function of a draw-cord such for instance as for puckering and crimping the bag'to close thesame.

It' will be understood that the draw-cord may be woven into the lone -material at any other suitable pick distance. In selecting any other pick distancefor the interweaving of the drawcord will be noted that it ishecessary to provide a ratchet wheel 3i having twice the number pf teeth -33 as the number of picks desired to be woven.

Referring more particularly to that form of he invention ill-ustrated in Figures '11 through '15 inclusive, the inuenticnis shown as applicable to a Crompton and Knowles box loom having a conventional whip roll te which has been modified according to the invention by providing its end portions 64 with knurling or other roughened surface parts,

According to the invention one or more rollers 65 is mounted at one or both sides of the loom frame. A roller 6-5 is mounted above the whip roll (53 in such relation that the peripheral surface of the roller 65 rests with its weight upon the knurled portion fi l of the whip roll 63 Thus the rotary motion of the whip roll 63 is imparted to the roller 65. The roller 65 is rotatably mounted on a stud 68 one end of which is carried by a bracket 6?. Such bracket 6'1 has an elongated slot E8 adjustably received over a bolt 13 carried by a frame plate H. A nut 74 is threaded upon that portion of the bolt 13 which projects inwardly beyond the bracket Bl for the purpose of binding the bracket Bl against the frame plate ll so as not to permit the bracket El and the roller 6%; to drop or rotate about the bolt 13. This binding engagement between the parts Bi and H also prevents the bracket 61 from sliding forwardly on the bolt is which would permit the roller 65 to back away from the whip roll 63 A spacing sleeve "l2 welded or otherwise affixed to the plate ii and to the loom frame 2 3 serves to maintain the plate H in a proper inwardly set position to receive the bracket 51!. A drawcord spool support 58 is bolted or otherwise affixed to the loom frame 24 and carries a shaft 59*, which in turn rotatably supports a drawcord spool 60 which contains a supply of the draw-cord. A friction strap E5 is laid over the spool Se or the supply of draw-cord thereon and carries at its lower end a weight 76 by which to impose the necessary friction tension on the spool 66 The upper end of the strap is affixed to a suitable part of the loom frame.

An eye guide in is carried by an arm 69 which projects down diagonally from the rear end portion of the bracket 5?. As shown in Figure 13 the stud 68 may have a reduced threaded end 80 threaded directly into the bracket 61 or as shown in Figure 13 having a nut 8| thereon for holding the same to the bracket.

The draw-cord Al is shown in Figure 11 as being drawn down from the spool 60 through the eye it and thence on to the knurled portion 64 of the whip roll 63 and through the bight or nip between the whip roll 63 and the pressure roller 65. From this point the draw-cord fl'l is carried forwardly to its harness.

This mechanism is designed to weave in an amount of draw-cord A? in excess of the material being woven. To this end during the initial threading operation of the draw-cord in the heddles and harness, an appreciable amount of slack in the draw-cord 4'? is left between the whip roll 63 and the harness frame. This slack is maintained throughout the weaving operation due to the fact that the draw-cord has a positive feed through the knurled portion 64 of the whip roll 63 and the pressure roller 65. The whip roll 63 is rotated in the usual manner by the warp mass passing thereover.

What is claimed is:

1. For use with a loom having a vibratory member, a mechanism for weaving draw-cord in the material woven by the loom comprising a harness for the draw-cord biased to a predetermined shedding position, a cam follower coupled to said harness, a rotary cam for said cam follower having a high point adapted to shift said harness to a subsequent shedding position, an intermittent motion device coupled to rotate said cam and coupled to receive its motion from the vibratory member, and spring means coupled to said harness for biasing the harness to the predetermined shedding position and also for drawing the cam follower against the high point of the cam.

2. A mechanism for weaving draw-cord as claimed in claim 1 characterized by the fact that said harness has a plurality of harness wires spaced apart in the fabric being woven by the loom and receiving a plurality of draw-cords woven in the fabric on laterally spaced lines.

3. For use with a conventional loom having a lay sword and its rocking shaft, a mechanism for Weaving draw-cord in the material woven by the loom comprising an arm fixed to rock with the lay sword shaft, a pawl pivotally carried by said arm, a ratchet wheel having a predetermined number of inclined and shouldered ratchet teeth engaged by said pawl for transmitting step by step rotation to the ratchet wheel on vibratory motion of said arm, a cam shaft on which said ratchet wheel is afiixed, a cam affixed to said cam shaft, a cam follower for said cam, a pivotally mounted arm carrying said cam follower,

a harness for the draw-cord biased to a predetermined shedding position and coupled to said cam follower, a brake drum afiixed to said cam shaft, and a resiliently tensioned brake band about said drum.

4. For use with a loom having the conventiona harness and lay member, a mechanism for weaving draw-cord in the material woven by the loom comprising a pair of eyeleted heddle wires arranged in substantially spaced parallel relation, a connecting strap between said heddle wires, means for movably supporting said strap in the upper portion of the loom frame, spring means connected to the lower end of one of the wires for biasing the harness to a predetermined shedding position, and means operable by the lay member of the loom and for relatively reversing the predetermined shedding position of said harness wires.

5. For use with a loom having conventional shedding and lay members, a mechanism for weaving draw-cord in the material being woven by the loom comprising a draw-cord harness for receiving the draw-cord, means operable by the lay member of the loom for operating the harness to raise or lower the draw-cord above or below the shed being formed by the conventional loom shedding motion, and a positive feeding device for feeding the draw-cord to the harness.

6. A mechanism for weaving draw-cord as claimed in claim 5 characterized by the fact that the positive feed device comprises a whip roll having a roughened portion over which the draw cord passes, a ressure roll engaging the roughened portion of said whip roll, and means for guiding the draw cord from a source of supply through the bight between the roughened portion of the whip roll and said pressure roll.

7. A mechanism for weaving draw-cord as claimed in claim 6 further characterized by the fact that the pressure roller is carried bya bracket longitudinally and pivotally adjustable about the loom frame and having a device to secure the bracket in fixed position.

8. A mechanism for weaving draw-cord as claimed in claim '7 in which said bracket has a diagonal downwardly extending arm carrying a guide eye for the draw-cord adjacent the bight between the whip roll and pressure roller.

9. For use with a loom having the conventional "a -mam harness and l'a-y member, a mechanism for weavin'g draw-cord in the material woven by the 100m comprising an eyeleted hedd-le wire adapted to receive the draw-cord, resilient means'connected to one end of the heddle wire for biasing the same to a predetermined shedding position, and means operable by the lay member of the-loom for relatively reversing the predetermined shed-- ding position of said iheddle wire.

10.- For use with a conventional loom having a lay sword and its rocking shaft, amechanism for weaving draw-cord in the material woven by the loom comprising an arm fixed to rock with the lay sword shaft, .a pawl pivotal-1y :carried by said arm, a ratchet wheel having a predetermined number of inclined and shouldered ratchet teeth engaged by said pawl for transmitting :step by step rotation to the ratchet wheel on vibratory motion of said arm, a cam shaft on which said ratchet wheel is afiixed, a cam affixed to said cam shaft, a cam follower for-said cam, a pivotally mounted arm carrying said cam follower, a harness for the draw-cord biased to a predeterimined shedding position and coupled to said cam follower, and braking means on said cam shaft for preventing overthrow of -the eam by the pawl.

CHARLTON HUDSON WILLIAMS.

REFERENCES CITED The renewing references are of record in the file of this patent;

UNITED STATES PATENTS U Name Date a Bernstdin' mr Graiiwi'ler Sept. 19,1882 j Lancaster Fe'bffi, "1895 913,095 Belavaric'e Feb. 23, 1909 1,731,317 Kenyon Nov, 18, 1930 1,807,726 Briekman in" June "2, 1931 1,832,495 Moberg NOV. 17, 1931 1,948,950 Daniels Feb. 2'7, I934 1,950,323 Ornstein Feb. 27, 1934 2,052,777 Lawson Sept. 1, 1936 FOREIGN PATENTS Number Country Date 6,735 Great'Britain of 1891 126,443 Great Britain Ma-y 6',191:9 

